Combine two exotic armors for each class, armors can only be from one class and applied to said class.
Personally, I'd like to see 'Mind of the Obsidian Ram' Melee attacks for Voidwalker trigger life steal and recharge your super. Kills with nova bomb recharge next nova bomb and kills with energy drain recharge next energy drain.
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-Eternal warrior + helm of inmost light = Eternal Light -Purifier Robes + Heart of the Praxic Fire = Fire Robes -Celestial Nighthawk + Symbiote = Celestial Symbiote